IRP-6
See these links for additional information; comprehensive background; overview of the case with important details available here and two excellent stories available here and here. Also see these links for the story on the IRP6 as well as an interview and article written by Mr. David Banks, one of the IRP6.

GOVERNMENT SURVEILLANCEFinal report of the Select Committee to Study Governmental Operations with Respect to Intelligence Activities, United States Senate. Also available in other formats here and here.